Telephonic communications – Substation or terminal circuitry – For loudspeaking terminal
Patent
1992-01-17
1994-06-21
Dwyer, James L.
Telephonic communications
Substation or terminal circuitry
For loudspeaking terminal
379390, 379416, 375 99, H04M 908
Patent
active
053234570
ABSTRACT:
A white noise suppressing circuit for suppressing white noise contained in a received voice of a speaker telephone apparatus includes a filter for suppressing white noise contained in an aural input signal input to an aural signal line, a switch for short-circuiting the filter, a detecting circuit for detecting the aural input signal, and a comparator for comparing an output of the detecting circuit with a preset voltage and for controlling the switch on the basis of the results of the comparison. When it is determined by the comparator that there is a voice input, the switch is short-circuited to make the filter inoperable. When there is no voice input, the switch is opened so as to make the filter operate.
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Ehara Tatsuji
Komoda Motoyoshi
Matsushita Akimasa
Dwyer James L.
NEC Corporation
Shehata M.
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